I love these! I am probably going to get the KSO's as well for running on the trails and general use. The Bikila's have done wonder in the limited time I have run in them with helping me find my natural stride. I run about 1.5-2 miles in them at a time about once a week (until an injury which is why I only have a few miles in them at this point). I plan on slowly increasing that distance in them and also plan on using these on the trails to see how they do there. As of now I have only used these on the road. I will definitely buy VFF's again!